臺式電導(dao)率儀技術性能
1.工(gong)作條件(jian)
? 環境溫度(du): 5～35℃ 相對濕度(du): ＜85％
? 供電電源： 220V±10% 50Hz ± 1Hz
? 無顯(xian)著的振動(dong)
? 除(chu)地磁場外無(wu)其他強(qiang)磁場干(gan)擾。
2.主要技術指標
? 測(ce)量范圍：電導率： (0～199.9)μs/cm ；(200～1999)μs/cm ；
(2.00～19.99)ms/cm ；(20.0～199.9)ms/cm ；
? 分辨率： 0.1/1μs/cm ；0.01/0.1ms/cm ；
? 準(zhun) 確(que) 度： 電計(ji):±1.0%FS;配套:±1.5%FS
? 溫度補償范圍：0～50℃ （手動/自動）
? 溫 度 系(xi) 數(shu)： 2.0%/℃
? 可選配電規格常(chang)數： 0.1、1、10
? 數據儲存：50組(zu)
? 儲存內容(rong)：編號、測量(liang)值、測量(liang)單(dan)位和溫度(du)值
? 電源：DC9V適配器
? 外形尺寸及重量： 220×200×80mm(長(chang)×寬×高) 0.7 kg
臺式電(dian)導率儀工作原理
在電(dian)解質溶液中，帶電(dian)離(li)子在電(dian)場作用(yong)下產生(sheng)移(yi)動而傳遞電(dian)流(liu)。其導(dao)電(dian)能力以電(dian)導(dao)度G來表(biao)示，其值(zhi)為電(dian)阻(zu)的倒數。 即 G＝1/R
測試電(dian)導度大小的(de)方法，可用兩(liang)個金屬板(ban)組(zu)成(cheng)的(de)電(dian)插入溶液中，形成(cheng)一個電(dian)導池，測出(chu)兩(liang)板(ban)間(jian)的(de)電(dian)阻。根據歐姆定律，該(gai)電(dian)阻值與(yu)板(ban)之(zhi)間(jian)的(de)距離L（cm）成(cheng)正比(bi)，與(yu)板(ban)的(de)面(mian)積A（cm2）成(cheng)反比(bi)。 即 R＝ρ?L/A
ρ為電(dian)(dian)阻率 ,令其(qi)倒數為電(dian)(dian)導率并以K表示，則K＝1/ρ
對(dui)于某一支(zhi)電而(er)言，電板之間的有效距離L與(yu)板的面積A之比稱為這支(zhi)電的電常數，用J表示， 即J＝L/A
根據(ju)以(yi)上(shang)各式可得(de)：
G＝K/J 即K=G?J
電導G的單位(wei)為西門子，單位(wei)符(fu)號是S。
1S＝103ms＝106μS
電導率(lv)K的常用(yong)單位(wei)為(wei)mS／cm及(ji)μS／cm。
本儀器(qi)測試電(dian)(dian)(dian)(dian)(dian)(dian)導(dao)的(de)(de)方法，是通(tong)過由振蕩器(qi)產生的(de)(de)交流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)加在電(dian)(dian)(dian)(dian)(dian)(dian)上（加交流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)目的(de)(de)是為了避(bi)免引起電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)化），電(dian)(dian)(dian)(dian)(dian)(dian)導(dao)池內產生電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，此電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)與(yu)被測溶液的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)導(dao)率成正比，經(jing)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)-電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)變換(huan)(huan)、放大、檢波，變換(huan)(huan)為直流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)，通(tong)過溫度補償等，較后經(jing)A/D轉換(huan)(huan)器(qi)轉換(huan)(huan)成數字信(xin)號，通(tong)過微電(dian)(dian)(dian)(dian)(dian)(dian)腦顯示(shi)。整個(ge)過程均由微電(dian)(dian)(dian)(dian)(dian)(dian)腦控(kong)制和處理。
臺式電(dian)(dian)(dian)(dian)(dian)導率(lv)儀(yi)測(ce)(ce)試電(dian)(dian)(dian)(dian)(dian)導的方法(fa)是通(tong)過由(you)振蕩器(qi)產生(sheng)的交(jiao)流電(dian)(dian)(dian)(dian)(dian)壓(ya)加在(zai)電(dian)(dian)(dian)(dian)(dian)上（加交(jiao)流電(dian)(dian)(dian)(dian)(dian)壓(ya)的目(mu)的是為(wei)了避免引起電(dian)(dian)(dian)(dian)(dian)的化(hua)），電(dian)(dian)(dian)(dian)(dian)導池(chi)內產生(sheng)電(dian)(dian)(dian)(dian)(dian)流，此電(dian)(dian)(dian)(dian)(dian)流與被測(ce)(ce)溶液的電(dian)(dian)(dian)(dian)(dian)導率(lv)成正比(bi)，經(jing)電(dian)(dian)(dian)(dian)(dian)流-電(dian)(dian)(dian)(dian)(dian)壓(ya)變(bian)換(huan)(huan)、放大(da)、檢波(bo)，變(bian)換(huan)(huan)為(wei)直流電(dian)(dian)(dian)(dian)(dian)壓(ya)，通(tong)過溫度補(bu)償等，較后經(jing)A/D轉(zhuan)換(huan)(huan)器(qi)轉(zhuan)換(huan)(huan)成數(shu)字信號，通(tong)過微(wei)電(dian)(dian)(dian)(dian)(dian)腦(nao)顯(xian)示。整(zheng)個過程均由(you)微(wei)電(dian)(dian)(dian)(dian)(dian)腦(nao)控制和處理。